They can't find anything that implicates me unless I am involved somehow.
That is clearly wrong. For proof, look at people who have been acquitted of crimes -- not all of them are factually innocent of the crime charged, but plenty are.
Then there are all the people who have been arrested based on probable cause that turned out to wrong, so the cops have to let them go. I recall two instances of this: In one case, the blood was red paint. In another, it was from hamburger meat.
How about the folks who are badgered into false confessions? What about police reports that contain lies? What about statements made to police that are twisted to mean something the truthful person did not intend to say? What if LE has tunnel vision, wants to close the case and move on, and targets innocent you?
There are also people who are factually innocent who have been wrongfully convicted. LE sometimes makes mistakes, botches investigations, lies on search warrant applications, lies on lab reports or incompetently completes laboratory testing, lies to the jury, and so forth, and not only in cases in which the defendant is factually guilty.
What if your proof of innocence is that you could not have committed the crime, because at the time you are on an airplane (pre 9/11), and you have the ticket, the testimony of the airline through its employee, and the testimony of a friend who met you at the airport, to prove it? That's not enough according to one jury! Remember: Juries determine the credibility of the witnesses (can choose to believe all, some, or none of what they say) and the facts of the case. Keep in mind also that a factually innocent defendant's very best chance of being acquitted is at his trial.
Your innocence does not guarantee your safety from prosecution by the government. You can be accused, arrested, tried, and/or convicted of something you did not do. All it takes, ultimately, is a jury that is willing to believe LE over everyone else (including witnesses who lie to benefit LE to save their own skin) and that is unwilling to give the defendant the benefit of the doubt simply because he is a criminal defendant. (He wouldn't be here if he wasn't a criminal or even if he didn't do this crime, he sure did other crimes that he didn't get caught for.)